Frankfurt 2006 – scientific programme
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Q: Quantenoptik und Photonik
Q 64: Photonische Kristalle V
Q 64.2: Talk
Thursday, March 16, 2006, 14:15–14:30, HI
3D-2D-3D photonic crystal heterostructures by direct laser writing — •M. Deubel1, M. Wegener1, S. John2, S. Linden3, and G. von Freymann3 — 1Institut für Angewandte Physik, Universität Karlsruhe (TH), 76128 Karlsruhe — 2Department of Physics, University of Toronto, 60 St. George Street, Toronto, Ontario, M5S 1A7, Canada — 3Institut für Nanotechnologie, Forschungszentrum Karlsruhe in der Helmholtz-Gemeinschaft, 76021 Karlsruhe
In 2D photonic crystals, radiation losses into the third dimension pose fundamental performance limitations. These limitations can be overcome in 3D-2D-3D photonic crystal heterostructures, comprising waveguides etc. in the 2D layer. This architecture allows for the incorporation of several parallel 2D layers, leading to a true three-dimensional photonic circuitry.
Here we use direct laser writing [1] for the fabrication of corresponding photoresist templates. Combined with the recent breakthrough of silicon double inversion of polymeric templates [2] leading to the required high-index contrast structures, our work provides a starting point for the realization of the above challenging architectures.
To assess the optical quality of such structures, we have performed normal and oblique incidence transmittance spectroscopy. This reveals a peak related to the Fabry-Perot mode of the 2D structure clad between two 3D photonic crystal "mirrors". A direct comparison with calculated transmittance spectra reveals good agreement.
[1] M. Deubel et al., Nature Mater. 3, 444 (2004)
[2] N. Tétreault et al., Adv. Mater., DOI:10.1002/adma.200501674